/* * fs/cifs/smb2pdu.c * * Copyright (C) International Business Machines Corp., 2009, 2013 * Etersoft, 2012 * Author(s): Steve French (sfrench@us.ibm.com) * Pavel Shilovsky (pshilovsky@samba.org) 2012 * * Contains the routines for constructing the SMB2 PDUs themselves * * This library is free software; you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License as published * by the Free Software Foundation; either version 2.1 of the License, or * (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See * the GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */ /* Note that there are handle based routines which must be */ /* treated slightly differently for reconnection purposes since we never */ /* want to reuse a stale file handle and only the caller knows the file info */ #include #include #include #include #include #include #include #include #include "smb2pdu.h" #include "cifsglob.h" #include "cifsacl.h" #include "cifsproto.h" #include "smb2proto.h" #include "cifs_unicode.h" #include "cifs_debug.h" #include "ntlmssp.h" #include "smb2status.h" #include "smb2glob.h" #include "cifspdu.h" #include "cifs_spnego.h" /* * The following table defines the expected "StructureSize" of SMB2 requests * in order by SMB2 command. This is similar to "wct" in SMB/CIFS requests. * * Note that commands are defined in smb2pdu.h in le16 but the array below is * indexed by command in host byte order. */ static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = { /* SMB2_NEGOTIATE */ 36, /* SMB2_SESSION_SETUP */ 25, /* SMB2_LOGOFF */ 4, /* SMB2_TREE_CONNECT */ 9, /* SMB2_TREE_DISCONNECT */ 4, /* SMB2_CREATE */ 57, /* SMB2_CLOSE */ 24, /* SMB2_FLUSH */ 24, /* SMB2_READ */ 49, /* SMB2_WRITE */ 49, /* SMB2_LOCK */ 48, /* SMB2_IOCTL */ 57, /* SMB2_CANCEL */ 4, /* SMB2_ECHO */ 4, /* SMB2_QUERY_DIRECTORY */ 33, /* SMB2_CHANGE_NOTIFY */ 32, /* SMB2_QUERY_INFO */ 41, /* SMB2_SET_INFO */ 33, /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */ }; static int encryption_required(const struct cifs_tcon *tcon) { if (!tcon) return 0; if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) || (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA)) return 1; if (tcon->seal && (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)) return 1; return 0; } static void smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd, const struct cifs_tcon *tcon) { shdr->ProtocolId = SMB2_PROTO_NUMBER; shdr->StructureSize = cpu_to_le16(64); shdr->Command = smb2_cmd; if (tcon && tcon->ses && tcon->ses->server) { struct TCP_Server_Info *server = tcon->ses->server; spin_lock(&server->req_lock); /* Request up to 2 credits but don't go over the limit. */ if (server->credits >= server->max_credits) shdr->CreditRequest = cpu_to_le16(0); else shdr->CreditRequest = cpu_to_le16( min_t(int, server->max_credits - server->credits, 2)); spin_unlock(&server->req_lock); } else { shdr->CreditRequest = cpu_to_le16(2); } shdr->ProcessId = cpu_to_le32((__u16)current->tgid); if (!tcon) goto out; /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */ /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */ if ((tcon->ses) && (tcon->ses->server) && (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU)) shdr->CreditCharge = cpu_to_le16(1); /* else CreditCharge MBZ */ shdr->TreeId = tcon->tid; /* Uid is not converted */ if (tcon->ses) shdr->SessionId = tcon->ses->Suid; /* * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have * to pass the path on the Open SMB prefixed by \\server\share. * Not sure when we would need to do the augmented path (if ever) and * setting this flag breaks the SMB2 open operation since it is * illegal to send an empty path name (without \\server\share prefix) * when the DFS flag is set in the SMB open header. We could * consider setting the flag on all operations other than open * but it is safer to net set it for now. */ /* if (tcon->share_flags & SHI1005_FLAGS_DFS) shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */ if (tcon->ses && tcon->ses->server && tcon->ses->server->sign && !encryption_required(tcon)) shdr->Flags |= SMB2_FLAGS_SIGNED; out: return; } static int smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon) { int rc = 0; struct nls_table *nls_codepage; struct cifs_ses *ses; struct TCP_Server_Info *server; /* * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so * check for tcp and smb session status done differently * for those three - in the calling routine. */ if (tcon == NULL) return rc; if (smb2_command == SMB2_TREE_CONNECT) return rc; if (tcon->tidStatus == CifsExiting) { /* * only tree disconnect, open, and write, * (and ulogoff which does not have tcon) * are allowed as we start force umount. */ if ((smb2_command != SMB2_WRITE) && (smb2_command != SMB2_CREATE) && (smb2_command != SMB2_TREE_DISCONNECT)) { cifs_dbg(FYI, "can not send cmd %d while umounting\n", smb2_command); return -ENODEV; } } if ((!tcon->ses) || (tcon->ses->status == CifsExiting) || (!tcon->ses->server)) return -EIO; ses = tcon->ses; server = ses->server; /* * Give demultiplex thread up to 10 seconds to reconnect, should be * greater than cifs socket timeout which is 7 seconds */ while (server->tcpStatus == CifsNeedReconnect) { /* * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE * here since they are implicitly done when session drops. */ switch (smb2_command) { /* * BB Should we keep oplock break and add flush to exceptions? */ case SMB2_TREE_DISCONNECT: case SMB2_CANCEL: case SMB2_CLOSE: case SMB2_OPLOCK_BREAK: return -EAGAIN; } wait_event_interruptible_timeout(server->response_q, (server->tcpStatus != CifsNeedReconnect), 10 * HZ); /* are we still trying to reconnect? */ if (server->tcpStatus != CifsNeedReconnect) break; /* * on "soft" mounts we wait once. Hard mounts keep * retrying until process is killed or server comes * back on-line */ if (!tcon->retry) { cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n"); return -EHOSTDOWN; } } if (!tcon->ses->need_reconnect && !tcon->need_reconnect) return rc; nls_codepage = load_nls_default(); /* * need to prevent multiple threads trying to simultaneously reconnect * the same SMB session */ mutex_lock(&tcon->ses->session_mutex); /* * Recheck after acquire mutex. If another thread is negotiating * and the server never sends an answer the socket will be closed * and tcpStatus set to reconnect. */ if (server->tcpStatus == CifsNeedReconnect) { rc = -EHOSTDOWN; mutex_unlock(&tcon->ses->session_mutex); goto out; } rc = cifs_negotiate_protocol(0, tcon->ses); if (!rc && tcon->ses->need_reconnect) rc = cifs_setup_session(0, tcon->ses, nls_codepage); if (rc || !tcon->need_reconnect) { mutex_unlock(&tcon->ses->session_mutex); goto out; } cifs_mark_open_files_invalid(tcon); if (tcon->use_persistent) tcon->need_reopen_files = true; rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage); mutex_unlock(&tcon->ses->session_mutex); cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc); if (rc) goto out; if (smb2_command != SMB2_INTERNAL_CMD) queue_delayed_work(cifsiod_wq, &server->reconnect, 0); atomic_inc(&tconInfoReconnectCount); out: /* * Check if handle based operation so we know whether we can continue * or not without returning to caller to reset file handle. */ /* * BB Is flush done by server on drop of tcp session? Should we special * case it and skip above? */ switch (smb2_command) { case SMB2_FLUSH: case SMB2_READ: case SMB2_WRITE: case SMB2_LOCK: case SMB2_IOCTL: case SMB2_QUERY_DIRECTORY: case SMB2_CHANGE_NOTIFY: case SMB2_QUERY_INFO: case SMB2_SET_INFO: rc = -EAGAIN; } unload_nls(nls_codepage); return rc; } static void fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf, unsigned int *total_len) { struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf; /* lookup word count ie StructureSize from table */ __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)]; /* * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of * largest operations (Create) */ memset(buf, 0, 256); smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon); spdu->StructureSize2 = cpu_to_le16(parmsize); *total_len = parmsize + sizeof(struct smb2_sync_hdr); } /* * Allocate and return pointer to an SMB request hdr, and set basic * SMB information in the SMB header. If the return code is zero, this * function must have filled in request_buf pointer. */ static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon, void **request_buf, unsigned int *total_len) { int rc; rc = smb2_reconnect(smb2_command, tcon); if (rc) return rc; /* BB eventually switch this to SMB2 specific small buf size */ *request_buf = cifs_small_buf_get(); if (*request_buf == NULL) { /* BB should we add a retry in here if not a writepage? */ return -ENOMEM; } fill_small_buf(smb2_command, tcon, (struct smb2_sync_hdr *)(*request_buf), total_len); if (tcon != NULL) { #ifdef CONFIG_CIFS_STATS2 uint16_t com_code = le16_to_cpu(smb2_command); cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]); #endif cifs_stats_inc(&tcon->num_smbs_sent); } return rc; } #ifdef CONFIG_CIFS_SMB311 /* offset is sizeof smb2_negotiate_req but rounded up to 8 bytes */ #define OFFSET_OF_NEG_CONTEXT 0x68 /* sizeof(struct smb2_negotiate_req) */ #define SMB2_PREAUTH_INTEGRITY_CAPABILITIES cpu_to_le16(1) #define SMB2_ENCRYPTION_CAPABILITIES cpu_to_le16(2) static void build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt) { pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES; pneg_ctxt->DataLength = cpu_to_le16(38); pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1); pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE); get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE); pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512; } static void build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt) { pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES; pneg_ctxt->DataLength = cpu_to_le16(6); pneg_ctxt->CipherCount = cpu_to_le16(2); pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM; pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM; } static void assemble_neg_contexts(struct smb2_negotiate_req *req, unsigned int *total_len) { char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT; build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt); /* Add 2 to size to round to 8 byte boundary */ pneg_ctxt += 2 + sizeof(struct smb2_preauth_neg_context); build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt); req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT); req->NegotiateContextCount = cpu_to_le16(2); *total_len += 4 + sizeof(struct smb2_preauth_neg_context) + sizeof(struct smb2_encryption_neg_context); } #else static void assemble_neg_contexts(struct smb2_negotiate_req *req, unsigned int *total_len) { return; } #endif /* SMB311 */ /* * * SMB2 Worker functions follow: * * The general structure of the worker functions is: * 1) Call smb2_init (assembles SMB2 header) * 2) Initialize SMB2 command specific fields in fixed length area of SMB * 3) Call smb_sendrcv2 (sends request on socket and waits for response) * 4) Decode SMB2 command specific fields in the fixed length area * 5) Decode variable length data area (if any for this SMB2 command type) * 6) Call free smb buffer * 7) return * */ int SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses) { struct smb2_negotiate_req *req; struct smb2_negotiate_rsp *rsp; struct kvec iov[1]; struct kvec rsp_iov; int rc = 0; int resp_buftype; struct TCP_Server_Info *server = ses->server; int blob_offset, blob_length; char *security_blob; int flags = CIFS_NEG_OP; unsigned int total_len; cifs_dbg(FYI, "Negotiate protocol\n"); if (!server) { WARN(1, "%s: server is NULL!\n", __func__); return -EIO; } rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len); if (rc) return rc; req->sync_hdr.SessionId = 0; if (strcmp(ses->server->vals->version_string, SMB3ANY_VERSION_STRING) == 0) { req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID); req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID); req->DialectCount = cpu_to_le16(2); total_len += 4; } else if (strcmp(ses->server->vals->version_string, SMBDEFAULT_VERSION_STRING) == 0) { req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID); req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID); req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID); req->DialectCount = cpu_to_le16(3); total_len += 6; } else { /* otherwise send specific dialect */ req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id); req->DialectCount = cpu_to_le16(1); total_len += 2; } /* only one of SMB2 signing flags may be set in SMB2 request */ if (ses->sign) req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED); else if (global_secflags & CIFSSEC_MAY_SIGN) req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED); else req->SecurityMode = 0; req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities); /* ClientGUID must be zero for SMB2.02 dialect */ if (ses->server->vals->protocol_id == SMB20_PROT_ID) memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE); else { memcpy(req->ClientGUID, server->client_guid, SMB2_CLIENT_GUID_SIZE); if (ses->server->vals->protocol_id == SMB311_PROT_ID) assemble_neg_contexts(req, &total_len); } iov[0].iov_base = (char *)req; iov[0].iov_len = total_len; rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov); cifs_small_buf_release(req); rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base; /* * No tcon so can't do * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]); */ if (rc == -EOPNOTSUPP) { cifs_dbg(VFS, "Dialect not supported by server. Consider " "specifying vers=1.0 or vers=2.0 on mount for accessing" " older servers\n"); goto neg_exit; } else if (rc != 0) goto neg_exit; if (strcmp(ses->server->vals->version_string, SMB3ANY_VERSION_STRING) == 0) { if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) { cifs_dbg(VFS, "SMB2 dialect returned but not requested\n"); return -EIO; } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) { cifs_dbg(VFS, "SMB2.1 dialect returned but not requested\n"); return -EIO; } } else if (strcmp(ses->server->vals->version_string, SMBDEFAULT_VERSION_STRING) == 0) { if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) { cifs_dbg(VFS, "SMB2 dialect returned but not requested\n"); return -EIO; } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) { /* ops set to 3.0 by default for default so update */ ses->server->ops = &smb21_operations; } } else if (le16_to_cpu(rsp->DialectRevision) != ses->server->vals->protocol_id) { /* if requested single dialect ensure returned dialect matched */ cifs_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n", le16_to_cpu(rsp->DialectRevision)); return -EIO; } cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode); if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) cifs_dbg(FYI, "negotiated smb2.0 dialect\n"); else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) cifs_dbg(FYI, "negotiated smb2.1 dialect\n"); else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID)) cifs_dbg(FYI, "negotiated smb3.0 dialect\n"); else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID)) cifs_dbg(FYI, "negotiated smb3.02 dialect\n"); #ifdef CONFIG_CIFS_SMB311 else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n"); #endif /* SMB311 */ else { cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n", le16_to_cpu(rsp->DialectRevision)); rc = -EIO; goto neg_exit; } server->dialect = le16_to_cpu(rsp->DialectRevision); /* BB: add check that dialect was valid given dialect(s) we asked for */ /* SMB2 only has an extended negflavor */ server->negflavor = CIFS_NEGFLAVOR_EXTENDED; /* set it to the maximum buffer size value we can send with 1 credit */ server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize), SMB2_MAX_BUFFER_SIZE); server->max_read = le32_to_cpu(rsp->MaxReadSize); server->max_write = le32_to_cpu(rsp->MaxWriteSize); /* BB Do we need to validate the SecurityMode? */ server->sec_mode = le16_to_cpu(rsp->SecurityMode); server->capabilities = le32_to_cpu(rsp->Capabilities); /* Internal types */ server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES; security_blob = smb2_get_data_area_len(&blob_offset, &blob_length, &rsp->hdr); /* * See MS-SMB2 section 2.2.4: if no blob, client picks default which * for us will be * ses->sectype = RawNTLMSSP; * but for time being this is our only auth choice so doesn't matter. * We just found a server which sets blob length to zero expecting raw. */ if (blob_length == 0) { cifs_dbg(FYI, "missing security blob on negprot\n"); server->sec_ntlmssp = true; } rc = cifs_enable_signing(server, ses->sign); if (rc) goto neg_exit; if (blob_length) { rc = decode_negTokenInit(security_blob, blob_length, server); if (rc == 1) rc = 0; else if (rc == 0) rc = -EIO; } neg_exit: free_rsp_buf(resp_buftype, rsp); return rc; } int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon) { int rc = 0; struct validate_negotiate_info_req vneg_inbuf; struct validate_negotiate_info_rsp *pneg_rsp = NULL; u32 rsplen; u32 inbuflen; /* max of 4 dialects */ cifs_dbg(FYI, "validate negotiate\n"); /* * validation ioctl must be signed, so no point sending this if we * can not sign it (ie are not known user). Even if signing is not * required (enabled but not negotiated), in those cases we selectively * sign just this, the first and only signed request on a connection. * Having validation of negotiate info helps reduce attack vectors. */ if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) return 0; /* validation requires signing */ if (tcon->ses->user_name == NULL) { cifs_dbg(FYI, "Can't validate negotiate: null user mount\n"); return 0; /* validation requires signing */ } if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL) cifs_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n"); vneg_inbuf.Capabilities = cpu_to_le32(tcon->ses->server->vals->req_capabilities); memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid, SMB2_CLIENT_GUID_SIZE); if (tcon->ses->sign) vneg_inbuf.SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED); else if (global_secflags & CIFSSEC_MAY_SIGN) vneg_inbuf.SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED); else vneg_inbuf.SecurityMode = 0; if (strcmp(tcon->ses->server->vals->version_string, SMB3ANY_VERSION_STRING) == 0) { vneg_inbuf.Dialects[0] = cpu_to_le16(SMB30_PROT_ID); vneg_inbuf.Dialects[1] = cpu_to_le16(SMB302_PROT_ID); vneg_inbuf.DialectCount = cpu_to_le16(2); /* structure is big enough for 3 dialects, sending only 2 */ inbuflen = sizeof(struct validate_negotiate_info_req) - 2; } else if (strcmp(tcon->ses->server->vals->version_string, SMBDEFAULT_VERSION_STRING) == 0) { vneg_inbuf.Dialects[0] = cpu_to_le16(SMB21_PROT_ID); vneg_inbuf.Dialects[1] = cpu_to_le16(SMB30_PROT_ID); vneg_inbuf.Dialects[2] = cpu_to_le16(SMB302_PROT_ID); vneg_inbuf.DialectCount = cpu_to_le16(3); /* structure is big enough for 3 dialects */ inbuflen = sizeof(struct validate_negotiate_info_req); } else { /* otherwise specific dialect was requested */ vneg_inbuf.Dialects[0] = cpu_to_le16(tcon->ses->server->vals->protocol_id); vneg_inbuf.DialectCount = cpu_to_le16(1); /* structure is big enough for 3 dialects, sending only 1 */ inbuflen = sizeof(struct validate_negotiate_info_req) - 4; } rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID, FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */, false /* use_ipc */, (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req), (char **)&pneg_rsp, &rsplen); if (rc != 0) { cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc); return -EIO; } if (rsplen != sizeof(struct validate_negotiate_info_rsp)) { cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n", rsplen); /* relax check since Mac returns max bufsize allowed on ioctl */ if ((rsplen > CIFSMaxBufSize) || (rsplen < sizeof(struct validate_negotiate_info_rsp))) goto err_rsp_free; } /* check validate negotiate info response matches what we got earlier */ if (pneg_rsp->Dialect != cpu_to_le16(tcon->ses->server->vals->protocol_id)) goto vneg_out; if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode)) goto vneg_out; /* do not validate server guid because not saved at negprot time yet */ if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND | SMB2_LARGE_FILES) != tcon->ses->server->capabilities) goto vneg_out; /* validate negotiate successful */ cifs_dbg(FYI, "validate negotiate info successful\n"); kfree(pneg_rsp); return 0; vneg_out: cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n"); err_rsp_free: kfree(pneg_rsp); return -EIO; } enum securityEnum smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested) { switch (requested) { case Kerberos: case RawNTLMSSP: return requested; case NTLMv2: return RawNTLMSSP; case Unspecified: if (server->sec_ntlmssp && (global_secflags & CIFSSEC_MAY_NTLMSSP)) return RawNTLMSSP; if ((server->sec_kerberos || server->sec_mskerberos) && (global_secflags & CIFSSEC_MAY_KRB5)) return Kerberos; /* Fallthrough */ default: return Unspecified; } } struct SMB2_sess_data { unsigned int xid; struct cifs_ses *ses; struct nls_table *nls_cp; void (*func)(struct SMB2_sess_data *); int result; u64 previous_session; /* we will send the SMB in three pieces: * a fixed length beginning part, an optional * SPNEGO blob (which can be zero length), and a * last part which will include the strings * and rest of bcc area. This allows us to avoid * a large buffer 17K allocation */ int buf0_type; struct kvec iov[2]; }; static int SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data) { int rc; struct cifs_ses *ses = sess_data->ses; struct smb2_sess_setup_req *req; struct TCP_Server_Info *server = ses->server; unsigned int total_len; rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req, &total_len); if (rc) return rc; /* First session, not a reauthenticate */ req->sync_hdr.SessionId = 0; /* if reconnect, we need to send previous sess id, otherwise it is 0 */ req->PreviousSessionId = sess_data->previous_session; req->Flags = 0; /* MBZ */ /* to enable echos and oplocks */ req->sync_hdr.CreditRequest = cpu_to_le16(3); /* only one of SMB2 signing flags may be set in SMB2 request */ if (server->sign) req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED; else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */ req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED; else req->SecurityMode = 0; req->Capabilities = 0; req->Channel = 0; /* MBZ */ sess_data->iov[0].iov_base = (char *)req; /* 1 for pad */ sess_data->iov[0].iov_len = total_len - 1; /* * This variable will be used to clear the buffer * allocated above in case of any error in the calling function. */ sess_data->buf0_type = CIFS_SMALL_BUFFER; return 0; } static void SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data) { free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base); sess_data->buf0_type = CIFS_NO_BUFFER; } static int SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data) { int rc; struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base; struct kvec rsp_iov = { NULL, 0 }; /* Testing shows that buffer offset must be at location of Buffer[0] */ req->SecurityBufferOffset = cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */); req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len); /* BB add code to build os and lm fields */ rc = smb2_send_recv(sess_data->xid, sess_data->ses, sess_data->iov, 2, &sess_data->buf0_type, CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov); cifs_small_buf_release(sess_data->iov[0].iov_base); memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec)); return rc; } static int SMB2_sess_establish_session(struct SMB2_sess_data *sess_data) { int rc = 0; struct cifs_ses *ses = sess_data->ses; mutex_lock(&ses->server->srv_mutex); if (ses->server->ops->generate_signingkey) { rc = ses->server->ops->generate_signingkey(ses); if (rc) { cifs_dbg(FYI, "SMB3 session key generation failed\n"); mutex_unlock(&ses->server->srv_mutex); return rc; } } if (!ses->server->session_estab) { ses->server->sequence_number = 0x2; ses->server->session_estab = true; } mutex_unlock(&ses->server->srv_mutex); cifs_dbg(FYI, "SMB2/3 session established successfully\n"); spin_lock(&GlobalMid_Lock); ses->status = CifsGood; ses->need_reconnect = false; spin_unlock(&GlobalMid_Lock); return rc; } #ifdef CONFIG_CIFS_UPCALL static void SMB2_auth_kerberos(struct SMB2_sess_data *sess_data) { int rc; struct cifs_ses *ses = sess_data->ses; struct cifs_spnego_msg *msg; struct key *spnego_key = NULL; struct smb2_sess_setup_rsp *rsp = NULL; rc = SMB2_sess_alloc_buffer(sess_data); if (rc) goto out; spnego_key = cifs_get_spnego_key(ses); if (IS_ERR(spnego_key)) { rc = PTR_ERR(spnego_key); spnego_key = NULL; goto out; } msg = spnego_key->payload.data[0]; /* * check version field to make sure that cifs.upcall is * sending us a response in an expected form */ if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) { cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d", CIFS_SPNEGO_UPCALL_VERSION, msg->version); rc = -EKEYREJECTED; goto out_put_spnego_key; } ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len, GFP_KERNEL); if (!ses->auth_key.response) { cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory", msg->sesskey_len); rc = -ENOMEM; goto out_put_spnego_key; } ses->auth_key.len = msg->sesskey_len; sess_data->iov[1].iov_base = msg->data + msg->sesskey_len; sess_data->iov[1].iov_len = msg->secblob_len; rc = SMB2_sess_sendreceive(sess_data); if (rc) goto out_put_spnego_key; rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base; ses->Suid = rsp->hdr.sync_hdr.SessionId; ses->session_flags = le16_to_cpu(rsp->SessionFlags); rc = SMB2_sess_establish_session(sess_data); out_put_spnego_key: key_invalidate(spnego_key); key_put(spnego_key); out: sess_data->result = rc; sess_data->func = NULL; SMB2_sess_free_buffer(sess_data); } #else static void SMB2_auth_kerberos(struct SMB2_sess_data *sess_data) { cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n"); sess_data->result = -EOPNOTSUPP; sess_data->func = NULL; } #endif static void SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data); static void SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data) { int rc; struct cifs_ses *ses = sess_data->ses; struct smb2_sess_setup_rsp *rsp = NULL; char *ntlmssp_blob = NULL; bool use_spnego = false; /* else use raw ntlmssp */ u16 blob_length = 0; /* * If memory allocation is successful, caller of this function * frees it. */ ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL); if (!ses->ntlmssp) { rc = -ENOMEM; goto out_err; } ses->ntlmssp->sesskey_per_smbsess = true; rc = SMB2_sess_alloc_buffer(sess_data); if (rc) goto out_err; ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE), GFP_KERNEL); if (ntlmssp_blob == NULL) { rc = -ENOMEM; goto out; } build_ntlmssp_negotiate_blob(ntlmssp_blob, ses); if (use_spnego) { /* BB eventually need to add this */ cifs_dbg(VFS, "spnego not supported for SMB2 yet\n"); rc = -EOPNOTSUPP; goto out; } else { blob_length = sizeof(struct _NEGOTIATE_MESSAGE); /* with raw NTLMSSP we don't encapsulate in SPNEGO */ } sess_data->iov[1].iov_base = ntlmssp_blob; sess_data->iov[1].iov_len = blob_length; rc = SMB2_sess_sendreceive(sess_data); rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base; /* If true, rc here is expected and not an error */ if (sess_data->buf0_type != CIFS_NO_BUFFER && rsp->hdr.sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) rc = 0; if (rc) goto out; if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 != le16_to_cpu(rsp->SecurityBufferOffset)) { cifs_dbg(VFS, "Invalid security buffer offset %d\n", le16_to_cpu(rsp->SecurityBufferOffset)); rc = -EIO; goto out; } rc = decode_ntlmssp_challenge(rsp->Buffer, le16_to_cpu(rsp->SecurityBufferLength), ses); if (rc) goto out; cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n"); ses->Suid = rsp->hdr.sync_hdr.SessionId; ses->session_flags = le16_to_cpu(rsp->SessionFlags); out: kfree(ntlmssp_blob); SMB2_sess_free_buffer(sess_data); if (!rc) { sess_data->result = 0; sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate; return; } out_err: kfree(ses->ntlmssp); ses->ntlmssp = NULL; sess_data->result = rc; sess_data->func = NULL; } static void SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data) { int rc; struct cifs_ses *ses = sess_data->ses; struct smb2_sess_setup_req *req; struct smb2_sess_setup_rsp *rsp = NULL; unsigned char *ntlmssp_blob = NULL; bool use_spnego = false; /* else use raw ntlmssp */ u16 blob_length = 0; rc = SMB2_sess_alloc_buffer(sess_data); if (rc) goto out; req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base; req->sync_hdr.SessionId = ses->Suid; rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses, sess_data->nls_cp); if (rc) { cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc); goto out; } if (use_spnego) { /* BB eventually need to add this */ cifs_dbg(VFS, "spnego not supported for SMB2 yet\n"); rc = -EOPNOTSUPP; goto out; } sess_data->iov[1].iov_base = ntlmssp_blob; sess_data->iov[1].iov_len = blob_length; rc = SMB2_sess_sendreceive(sess_data); if (rc) goto out; rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base; ses->Suid = rsp->hdr.sync_hdr.SessionId; ses->session_flags = le16_to_cpu(rsp->SessionFlags); rc = SMB2_sess_establish_session(sess_data); out: kfree(ntlmssp_blob); SMB2_sess_free_buffer(sess_data); kfree(ses->ntlmssp); ses->ntlmssp = NULL; sess_data->result = rc; sess_data->func = NULL; } static int SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data) { int type; type = smb2_select_sectype(ses->server, ses->sectype); cifs_dbg(FYI, "sess setup type %d\n", type); if (type == Unspecified) { cifs_dbg(VFS, "Unable to select appropriate authentication method!"); return -EINVAL; } switch (type) { case Kerberos: sess_data->func = SMB2_auth_kerberos; break; case RawNTLMSSP: sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate; break; default: cifs_dbg(VFS, "secType %d not supported!\n", type); return -EOPNOTSUPP; } return 0; } int SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses, const struct nls_table *nls_cp) { int rc = 0; struct TCP_Server_Info *server = ses->server; struct SMB2_sess_data *sess_data; cifs_dbg(FYI, "Session Setup\n"); if (!server) { WARN(1, "%s: server is NULL!\n", __func__); return -EIO; } sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL); if (!sess_data) return -ENOMEM; rc = SMB2_select_sec(ses, sess_data); if (rc) goto out; sess_data->xid = xid; sess_data->ses = ses; sess_data->buf0_type = CIFS_NO_BUFFER; sess_data->nls_cp = (struct nls_table *) nls_cp; while (sess_data->func) sess_data->func(sess_data); if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign)) cifs_dbg(VFS, "signing requested but authenticated as guest\n"); rc = sess_data->result; out: kfree(sess_data); return rc; } int SMB2_logoff(const unsigned int xid, struct cifs_ses *ses) { struct smb2_logoff_req *req; /* response is also trivial struct */ int rc = 0; struct TCP_Server_Info *server; int flags = 0; unsigned int total_len; struct kvec iov[1]; struct kvec rsp_iov; int resp_buf_type; cifs_dbg(FYI, "disconnect session %p\n", ses); if (ses && (ses->server)) server = ses->server; else return -EIO; /* no need to send SMB logoff if uid already closed due to reconnect */ if (ses->need_reconnect) goto smb2_session_already_dead; rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len); if (rc) return rc; /* since no tcon, smb2_init can not do this, so do here */ req->sync_hdr.SessionId = ses->Suid; if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) flags |= CIFS_TRANSFORM_REQ; else if (server->sign) req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED; flags |= CIFS_NO_RESP; iov[0].iov_base = (char *)req; iov[0].iov_len = total_len; rc = smb2_send_recv(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov); cifs_small_buf_release(req); /* * No tcon so can't do * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]); */ smb2_session_already_dead: return rc; } static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code) { cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]); } #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */) /* These are similar values to what Windows uses */ static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon) { tcon->max_chunks = 256; tcon->max_bytes_chunk = 1048576; tcon->max_bytes_copy = 16777216; } int SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree, struct cifs_tcon *tcon, const struct nls_table *cp) { struct smb2_tree_connect_req *req; struct smb2_tree_connect_rsp *rsp = NULL; struct kvec iov[2]; struct kvec rsp_iov = { NULL, 0 }; int rc = 0; int resp_buftype; int unc_path_len; __le16 *unc_path = NULL; int flags = 0; unsigned int total_len; cifs_dbg(FYI, "TCON\n"); if (!(ses->server) || !tree) return -EIO; unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL); if (unc_path == NULL) return -ENOMEM; unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1; unc_path_len *= 2; if (unc_path_len < 2) { kfree(unc_path); return -EINVAL; } /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */ if (tcon) tcon->tid = 0; rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req, &total_len); if (rc) { kfree(unc_path); return rc; } if (tcon == NULL) { if ((ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)) flags |= CIFS_TRANSFORM_REQ; /* since no tcon, smb2_init can not do this, so do here */ req->sync_hdr.SessionId = ses->Suid; if (ses->server->sign) req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED; } else if (encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; iov[0].iov_base = (char *)req; /* 1 for pad */ iov[0].iov_len = total_len - 1; /* Testing shows that buffer offset must be at location of Buffer[0] */ req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req) - 1 /* pad */); req->PathLength = cpu_to_le16(unc_path_len - 2); iov[1].iov_base = unc_path; iov[1].iov_len = unc_path_len; rc = smb2_send_recv(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov); cifs_small_buf_release(req); rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base; if (rc != 0) { if (tcon) { cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE); tcon->need_reconnect = true; } goto tcon_error_exit; } if (tcon == NULL) { ses->ipc_tid = rsp->hdr.sync_hdr.TreeId; goto tcon_exit; } switch (rsp->ShareType) { case SMB2_SHARE_TYPE_DISK: cifs_dbg(FYI, "connection to disk share\n"); break; case SMB2_SHARE_TYPE_PIPE: tcon->ipc = true; cifs_dbg(FYI, "connection to pipe share\n"); break; case SMB2_SHARE_TYPE_PRINT: tcon->ipc = true; cifs_dbg(FYI, "connection to printer\n"); break; default: cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType); rc = -EOPNOTSUPP; goto tcon_error_exit; } tcon->share_flags = le32_to_cpu(rsp->ShareFlags); tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */ tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess); tcon->tidStatus = CifsGood; tcon->need_reconnect = false; tcon->tid = rsp->hdr.sync_hdr.TreeId; strlcpy(tcon->treeName, tree, sizeof(tcon->treeName)); if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) && ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0)) cifs_dbg(VFS, "DFS capability contradicts DFS flag\n"); if (tcon->seal && !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)) cifs_dbg(VFS, "Encryption is requested but not supported\n"); init_copy_chunk_defaults(tcon); if (tcon->ses->server->ops->validate_negotiate) rc = tcon->ses->server->ops->validate_negotiate(xid, tcon); tcon_exit: free_rsp_buf(resp_buftype, rsp); kfree(unc_path); return rc; tcon_error_exit: if (rsp && rsp->hdr.sync_hdr.Status == STATUS_BAD_NETWORK_NAME) { cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree); } goto tcon_exit; } int SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon) { struct smb2_tree_disconnect_req *req; /* response is trivial */ int rc = 0; struct cifs_ses *ses = tcon->ses; int flags = 0; unsigned int total_len; struct kvec iov[1]; struct kvec rsp_iov; int resp_buf_type; cifs_dbg(FYI, "Tree Disconnect\n"); if (!ses || !(ses->server)) return -EIO; if ((tcon->need_reconnect) || (tcon->ses->need_reconnect)) return 0; rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req, &total_len); if (rc) return rc; if (encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; flags |= CIFS_NO_RESP; iov[0].iov_base = (char *)req; iov[0].iov_len = total_len; rc = smb2_send_recv(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov); cifs_small_buf_release(req); if (rc) cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE); return rc; } static struct create_durable * create_durable_buf(void) { struct create_durable *buf; buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL); if (!buf) return NULL; buf->ccontext.DataOffset = cpu_to_le16(offsetof (struct create_durable, Data)); buf->ccontext.DataLength = cpu_to_le32(16); buf->ccontext.NameOffset = cpu_to_le16(offsetof (struct create_durable, Name)); buf->ccontext.NameLength = cpu_to_le16(4); /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */ buf->Name[0] = 'D'; buf->Name[1] = 'H'; buf->Name[2] = 'n'; buf->Name[3] = 'Q'; return buf; } static struct create_durable * create_reconnect_durable_buf(struct cifs_fid *fid) { struct create_durable *buf; buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL); if (!buf) return NULL; buf->ccontext.DataOffset = cpu_to_le16(offsetof (struct create_durable, Data)); buf->ccontext.DataLength = cpu_to_le32(16); buf->ccontext.NameOffset = cpu_to_le16(offsetof (struct create_durable, Name)); buf->ccontext.NameLength = cpu_to_le16(4); buf->Data.Fid.PersistentFileId = fid->persistent_fid; buf->Data.Fid.VolatileFileId = fid->volatile_fid; /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */ buf->Name[0] = 'D'; buf->Name[1] = 'H'; buf->Name[2] = 'n'; buf->Name[3] = 'C'; return buf; } static __u8 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp, unsigned int *epoch) { char *data_offset; struct create_context *cc; unsigned int next; unsigned int remaining; char *name; data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset); remaining = le32_to_cpu(rsp->CreateContextsLength); cc = (struct create_context *)data_offset; while (remaining >= sizeof(struct create_context)) { name = le16_to_cpu(cc->NameOffset) + (char *)cc; if (le16_to_cpu(cc->NameLength) == 4 && strncmp(name, "RqLs", 4) == 0) return server->ops->parse_lease_buf(cc, epoch); next = le32_to_cpu(cc->Next); if (!next) break; remaining -= next; cc = (struct create_context *)((char *)cc + next); } return 0; } static int add_lease_context(struct TCP_Server_Info *server, struct kvec *iov, unsigned int *num_iovec, __u8 *oplock) { struct smb2_create_req *req = iov[0].iov_base; unsigned int num = *num_iovec; iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock); if (iov[num].iov_base == NULL) return -ENOMEM; iov[num].iov_len = server->vals->create_lease_size; req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE; if (!req->CreateContextsOffset) req->CreateContextsOffset = cpu_to_le32( sizeof(struct smb2_create_req) + iov[num - 1].iov_len); le32_add_cpu(&req->CreateContextsLength, server->vals->create_lease_size); *num_iovec = num + 1; return 0; } static struct create_durable_v2 * create_durable_v2_buf(struct cifs_fid *pfid) { struct create_durable_v2 *buf; buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL); if (!buf) return NULL; buf->ccontext.DataOffset = cpu_to_le16(offsetof (struct create_durable_v2, dcontext)); buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2)); buf->ccontext.NameOffset = cpu_to_le16(offsetof (struct create_durable_v2, Name)); buf->ccontext.NameLength = cpu_to_le16(4); buf->dcontext.Timeout = 0; /* Should this be configurable by workload */ buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT); generate_random_uuid(buf->dcontext.CreateGuid); memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16); /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */ buf->Name[0] = 'D'; buf->Name[1] = 'H'; buf->Name[2] = '2'; buf->Name[3] = 'Q'; return buf; } static struct create_durable_handle_reconnect_v2 * create_reconnect_durable_v2_buf(struct cifs_fid *fid) { struct create_durable_handle_reconnect_v2 *buf; buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2), GFP_KERNEL); if (!buf) return NULL; buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2, dcontext)); buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_reconnect_context_v2)); buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2, Name)); buf->ccontext.NameLength = cpu_to_le16(4); buf->dcontext.Fid.PersistentFileId = fid->persistent_fid; buf->dcontext.Fid.VolatileFileId = fid->volatile_fid; buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT); memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16); /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */ buf->Name[0] = 'D'; buf->Name[1] = 'H'; buf->Name[2] = '2'; buf->Name[3] = 'C'; return buf; } static int add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec, struct cifs_open_parms *oparms) { struct smb2_create_req *req = iov[0].iov_base; unsigned int num = *num_iovec; iov[num].iov_base = create_durable_v2_buf(oparms->fid); if (iov[num].iov_base == NULL) return -ENOMEM; iov[num].iov_len = sizeof(struct create_durable_v2); if (!req->CreateContextsOffset) req->CreateContextsOffset = cpu_to_le32(sizeof(struct smb2_create_req) + iov[1].iov_len); le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2)); *num_iovec = num + 1; return 0; } static int add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec, struct cifs_open_parms *oparms) { struct smb2_create_req *req = iov[0].iov_base; unsigned int num = *num_iovec; /* indicate that we don't need to relock the file */ oparms->reconnect = false; iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid); if (iov[num].iov_base == NULL) return -ENOMEM; iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2); if (!req->CreateContextsOffset) req->CreateContextsOffset = cpu_to_le32(sizeof(struct smb2_create_req) + iov[1].iov_len); le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_handle_reconnect_v2)); *num_iovec = num + 1; return 0; } static int add_durable_context(struct kvec *iov, unsigned int *num_iovec, struct cifs_open_parms *oparms, bool use_persistent) { struct smb2_create_req *req = iov[0].iov_base; unsigned int num = *num_iovec; if (use_persistent) { if (oparms->reconnect) return add_durable_reconnect_v2_context(iov, num_iovec, oparms); else return add_durable_v2_context(iov, num_iovec, oparms); } if (oparms->reconnect) { iov[num].iov_base = create_reconnect_durable_buf(oparms->fid); /* indicate that we don't need to relock the file */ oparms->reconnect = false; } else iov[num].iov_base = create_durable_buf(); if (iov[num].iov_base == NULL) return -ENOMEM; iov[num].iov_len = sizeof(struct create_durable); if (!req->CreateContextsOffset) req->CreateContextsOffset = cpu_to_le32(sizeof(struct smb2_create_req) + iov[1].iov_len); le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable)); *num_iovec = num + 1; return 0; } static int alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len, const char *treename, const __le16 *path) { int treename_len, path_len; struct nls_table *cp; const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)}; /* * skip leading "\\" */ treename_len = strlen(treename); if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\')) return -EINVAL; treename += 2; treename_len -= 2; path_len = UniStrnlen((wchar_t *)path, PATH_MAX); /* * make room for one path separator between the treename and * path */ *out_len = treename_len + 1 + path_len; /* * final path needs to be null-terminated UTF16 with a * size aligned to 8 */ *out_size = roundup((*out_len+1)*2, 8); *out_path = kzalloc(*out_size, GFP_KERNEL); if (!*out_path) return -ENOMEM; cp = load_nls_default(); cifs_strtoUTF16(*out_path, treename, treename_len, cp); UniStrcat(*out_path, sep); UniStrcat(*out_path, path); unload_nls(cp); return 0; } int SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path, __u8 *oplock, struct smb2_file_all_info *buf, struct smb2_err_rsp **err_buf) { struct smb2_create_req *req; struct smb2_create_rsp *rsp; struct TCP_Server_Info *server; struct cifs_tcon *tcon = oparms->tcon; struct cifs_ses *ses = tcon->ses; struct kvec iov[4]; struct kvec rsp_iov = {NULL, 0}; int resp_buftype; int uni_path_len; __le16 *copy_path = NULL; int copy_size; int rc = 0; unsigned int n_iov = 2; __u32 file_attributes = 0; char *dhc_buf = NULL, *lc_buf = NULL; int flags = 0; unsigned int total_len; cifs_dbg(FYI, "create/open\n"); if (ses && (ses->server)) server = ses->server; else return -EIO; rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len); if (rc) return rc; if (encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; if (oparms->create_options & CREATE_OPTION_READONLY) file_attributes |= ATTR_READONLY; if (oparms->create_options & CREATE_OPTION_SPECIAL) file_attributes |= ATTR_SYSTEM; req->ImpersonationLevel = IL_IMPERSONATION; req->DesiredAccess = cpu_to_le32(oparms->desired_access); /* File attributes ignored on open (used in create though) */ req->FileAttributes = cpu_to_le32(file_attributes); req->ShareAccess = FILE_SHARE_ALL_LE; req->CreateDisposition = cpu_to_le32(oparms->disposition); req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK); iov[0].iov_base = (char *)req; /* -1 since last byte is buf[0] which is sent below (path) */ iov[0].iov_len = total_len - 1; req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)); /* [MS-SMB2] 2.2.13 NameOffset: * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of * the SMB2 header, the file name includes a prefix that will * be processed during DFS name normalization as specified in * section 3.3.5.9. Otherwise, the file name is relative to * the share that is identified by the TreeId in the SMB2 * header. */ if (tcon->share_flags & SHI1005_FLAGS_DFS) { int name_len; req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS; rc = alloc_path_with_tree_prefix(©_path, ©_size, &name_len, tcon->treeName, path); if (rc) return rc; req->NameLength = cpu_to_le16(name_len * 2); uni_path_len = copy_size; path = copy_path; } else { uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2; /* MUST set path len (NameLength) to 0 opening root of share */ req->NameLength = cpu_to_le16(uni_path_len - 2); if (uni_path_len % 8 != 0) { copy_size = roundup(uni_path_len, 8); copy_path = kzalloc(copy_size, GFP_KERNEL); if (!copy_path) return -ENOMEM; memcpy((char *)copy_path, (const char *)path, uni_path_len); uni_path_len = copy_size; path = copy_path; } } iov[1].iov_len = uni_path_len; iov[1].iov_base = path; if (!server->oplocks) *oplock = SMB2_OPLOCK_LEVEL_NONE; if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) || *oplock == SMB2_OPLOCK_LEVEL_NONE) req->RequestedOplockLevel = *oplock; else { rc = add_lease_context(server, iov, &n_iov, oplock); if (rc) { cifs_small_buf_release(req); kfree(copy_path); return rc; } lc_buf = iov[n_iov-1].iov_base; } if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) { /* need to set Next field of lease context if we request it */ if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) { struct create_context *ccontext = (struct create_context *)iov[n_iov-1].iov_base; ccontext->Next = cpu_to_le32(server->vals->create_lease_size); } rc = add_durable_context(iov, &n_iov, oparms, tcon->use_persistent); if (rc) { cifs_small_buf_release(req); kfree(copy_path); kfree(lc_buf); return rc; } dhc_buf = iov[n_iov-1].iov_base; } rc = smb2_send_recv(xid, ses, iov, n_iov, &resp_buftype, flags, &rsp_iov); cifs_small_buf_release(req); rsp = (struct smb2_create_rsp *)rsp_iov.iov_base; if (rc != 0) { cifs_stats_fail_inc(tcon, SMB2_CREATE_HE); if (err_buf && rsp) *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4, GFP_KERNEL); goto creat_exit; } oparms->fid->persistent_fid = rsp->PersistentFileId; oparms->fid->volatile_fid = rsp->VolatileFileId; if (buf) { memcpy(buf, &rsp->CreationTime, 32); buf->AllocationSize = rsp->AllocationSize; buf->EndOfFile = rsp->EndofFile; buf->Attributes = rsp->FileAttributes; buf->NumberOfLinks = cpu_to_le32(1); buf->DeletePending = 0; } if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE) *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch); else *oplock = rsp->OplockLevel; creat_exit: kfree(copy_path); kfree(lc_buf); kfree(dhc_buf); free_rsp_buf(resp_buftype, rsp); return rc; } /* * SMB2 IOCTL is used for both IOCTLs and FSCTLs */ int SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, u32 opcode, bool is_fsctl, bool use_ipc, char *in_data, u32 indatalen, char **out_data, u32 *plen /* returned data len */) { struct smb2_ioctl_req *req; struct smb2_ioctl_rsp *rsp; struct smb2_sync_hdr *shdr; struct cifs_ses *ses; struct kvec iov[2]; struct kvec rsp_iov; int resp_buftype; int n_iov; int rc = 0; int flags = 0; unsigned int total_len; cifs_dbg(FYI, "SMB2 IOCTL\n"); if (out_data != NULL) *out_data = NULL; /* zero out returned data len, in case of error */ if (plen) *plen = 0; if (tcon) ses = tcon->ses; else return -EIO; if (!ses || !(ses->server)) return -EIO; rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len); if (rc) return rc; if (use_ipc) { if (ses->ipc_tid == 0) { cifs_small_buf_release(req); return -ENOTCONN; } cifs_dbg(FYI, "replacing tid 0x%x with IPC tid 0x%x\n", req->sync_hdr.TreeId, ses->ipc_tid); req->sync_hdr.TreeId = ses->ipc_tid; } if (encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; req->CtlCode = cpu_to_le32(opcode); req->PersistentFileId = persistent_fid; req->VolatileFileId = volatile_fid; if (indatalen) { req->InputCount = cpu_to_le32(indatalen); /* do not set InputOffset if no input data */ req->InputOffset = cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer)); iov[1].iov_base = in_data; iov[1].iov_len = indatalen; n_iov = 2; } else n_iov = 1; req->OutputOffset = 0; req->OutputCount = 0; /* MBZ */ /* * Could increase MaxOutputResponse, but that would require more * than one credit. Windows typically sets this smaller, but for some * ioctls it may be useful to allow server to send more. No point * limiting what the server can send as long as fits in one credit * Unfortunately - we can not handle more than CIFS_MAX_MSG_SIZE * (by default, note that it can be overridden to make max larger) * in responses (except for read responses which can be bigger. * We may want to bump this limit up */ req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize); if (is_fsctl) req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL); else req->Flags = 0; iov[0].iov_base = (char *)req; /* * If no input data, the size of ioctl struct in * protocol spec still includes a 1 byte data buffer, * but if input data passed to ioctl, we do not * want to double count this, so we do not send * the dummy one byte of data in iovec[0] if sending * input data (in iovec[1]). */ if (indatalen) { iov[0].iov_len = total_len - 1; } else iov[0].iov_len = total_len; /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */ if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED; rc = smb2_send_recv(xid, ses, iov, n_iov, &resp_buftype, flags, &rsp_iov); cifs_small_buf_release(req); rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base; if ((rc != 0) && (rc != -EINVAL)) { cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE); goto ioctl_exit; } else if (rc == -EINVAL) { if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) && (opcode != FSCTL_SRV_COPYCHUNK)) { cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE); goto ioctl_exit; } } /* check if caller wants to look at return data or just return rc */ if ((plen == NULL) || (out_data == NULL)) goto ioctl_exit; *plen = le32_to_cpu(rsp->OutputCount); /* We check for obvious errors in the output buffer length and offset */ if (*plen == 0) goto ioctl_exit; /* server returned no data */ else if (*plen > 0xFF00) { cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen); *plen = 0; rc = -EIO; goto ioctl_exit; } if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) { cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen, le32_to_cpu(rsp->OutputOffset)); *plen = 0; rc = -EIO; goto ioctl_exit; } *out_data = kmalloc(*plen, GFP_KERNEL); if (*out_data == NULL) { rc = -ENOMEM; goto ioctl_exit; } shdr = get_sync_hdr(rsp); memcpy(*out_data, (char *)shdr + le32_to_cpu(rsp->OutputOffset), *plen); ioctl_exit: free_rsp_buf(resp_buftype, rsp); return rc; } /* * Individual callers to ioctl worker function follow */ int SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid) { int rc; struct compress_ioctl fsctl_input; char *ret_data = NULL; fsctl_input.CompressionState = cpu_to_le16(COMPRESSION_FORMAT_DEFAULT); rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid, FSCTL_SET_COMPRESSION, true /* is_fsctl */, false /* use_ipc */, (char *)&fsctl_input /* data input */, 2 /* in data len */, &ret_data /* out data */, NULL); cifs_dbg(FYI, "set compression rc %d\n", rc); return rc; } int SMB2_close(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid) { struct smb2_close_req *req; struct smb2_close_rsp *rsp; struct cifs_ses *ses = tcon->ses; struct kvec iov[1]; struct kvec rsp_iov; int resp_buftype; int rc = 0; int flags = 0; unsigned int total_len; cifs_dbg(FYI, "Close\n"); if (!ses || !(ses->server)) return -EIO; rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len); if (rc) return rc; if (encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; req->PersistentFileId = persistent_fid; req->VolatileFileId = volatile_fid; iov[0].iov_base = (char *)req; iov[0].iov_len = total_len; rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov); cifs_small_buf_release(req); rsp = (struct smb2_close_rsp *)rsp_iov.iov_base; if (rc != 0) { cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE); goto close_exit; } /* BB FIXME - decode close response, update inode for caching */ close_exit: free_rsp_buf(resp_buftype, rsp); return rc; } static int validate_buf(unsigned int offset, unsigned int buffer_length, struct smb2_hdr *hdr, unsigned int min_buf_size) { unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length); char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr; char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr; char *end_of_buf = begin_of_buf + buffer_length; if (buffer_length < min_buf_size) { cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n", buffer_length, min_buf_size); return -EINVAL; } /* check if beyond RFC1001 maximum length */ if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) { cifs_dbg(VFS, "buffer length %d or smb length %d too large\n", buffer_length, smb_len); return -EINVAL; } if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) { cifs_dbg(VFS, "illegal server response, bad offset to data\n"); return -EINVAL; } return 0; } /* * If SMB buffer fields are valid, copy into temporary buffer to hold result. * Caller must free buffer. */ static int validate_and_copy_buf(unsigned int offset, unsigned int buffer_length, struct smb2_hdr *hdr, unsigned int minbufsize, char *data) { char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr; int rc; if (!data) return -EINVAL; rc = validate_buf(offset, buffer_length, hdr, minbufsize); if (rc) return rc; memcpy(data, begin_of_buf, buffer_length); return 0; } static int query_info(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type, u32 additional_info, size_t output_len, size_t min_len, void **data, u32 *dlen) { struct smb2_query_info_req *req; struct smb2_query_info_rsp *rsp = NULL; struct kvec iov[2]; struct kvec rsp_iov; int rc = 0; int resp_buftype; struct cifs_ses *ses = tcon->ses; int flags = 0; unsigned int total_len; cifs_dbg(FYI, "Query Info\n"); if (!ses || !(ses->server)) return -EIO; rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req, &total_len); if (rc) return rc; if (encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; req->InfoType = info_type; req->FileInfoClass = info_class; req->PersistentFileId = persistent_fid; req->VolatileFileId = volatile_fid; req->AdditionalInformation = cpu_to_le32(additional_info); /* * We do not use the input buffer (do not send extra byte) */ req->InputBufferOffset = 0; req->OutputBufferLength = cpu_to_le32(output_len); iov[0].iov_base = (char *)req; /* 1 for Buffer */ iov[0].iov_len = total_len - 1; rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov); cifs_small_buf_release(req); rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base; if (rc) { cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE); goto qinf_exit; } if (dlen) { *dlen = le32_to_cpu(rsp->OutputBufferLength); if (!*data) { *data = kmalloc(*dlen, GFP_KERNEL); if (!*data) { cifs_dbg(VFS, "Error %d allocating memory for acl\n", rc); *dlen = 0; goto qinf_exit; } } } rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset), le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr, min_len, *data); qinf_exit: free_rsp_buf(resp_buftype, rsp); return rc; } int SMB2_query_eas(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, int ea_buf_size, struct smb2_file_full_ea_info *data) { return query_info(xid, tcon, persistent_fid, volatile_fid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 0, ea_buf_size, sizeof(struct smb2_file_full_ea_info), (void **)&data, NULL); } int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data) { return query_info(xid, tcon, persistent_fid, volatile_fid, FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0, sizeof(struct smb2_file_all_info) + PATH_MAX * 2, sizeof(struct smb2_file_all_info), (void **)&data, NULL); } int SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, void **data, u32 *plen) { __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO; *plen = 0; return query_info(xid, tcon, persistent_fid, volatile_fid, 0, SMB2_O_INFO_SECURITY, additional_info, SMB2_MAX_BUFFER_SIZE, sizeof(struct smb2_file_all_info), data, plen); } int SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid) { return query_info(xid, tcon, persistent_fid, volatile_fid, FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0, sizeof(struct smb2_file_internal_info), sizeof(struct smb2_file_internal_info), (void **)&uniqueid, NULL); } /* * This is a no-op for now. We're not really interested in the reply, but * rather in the fact that the server sent one and that server->lstrp * gets updated. * * FIXME: maybe we should consider checking that the reply matches request? */ static void smb2_echo_callback(struct mid_q_entry *mid) { struct TCP_Server_Info *server = mid->callback_data; struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf; unsigned int credits_received = 1; if (mid->mid_state == MID_RESPONSE_RECEIVED) credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest); DeleteMidQEntry(mid); add_credits(server, credits_received, CIFS_ECHO_OP); } void smb2_reconnect_server(struct work_struct *work) { struct TCP_Server_Info *server = container_of(work, struct TCP_Server_Info, reconnect.work); struct cifs_ses *ses; struct cifs_tcon *tcon, *tcon2; struct list_head tmp_list; int tcon_exist = false; int rc; int resched = false; /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */ mutex_lock(&server->reconnect_mutex); INIT_LIST_HEAD(&tmp_list); cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n"); spin_lock(&cifs_tcp_ses_lock); list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) { list_for_each_entry(tcon, &ses->tcon_list, tcon_list) { if (tcon->need_reconnect || tcon->need_reopen_files) { tcon->tc_count++; list_add_tail(&tcon->rlist, &tmp_list); tcon_exist = true; } } } /* * Get the reference to server struct to be sure that the last call of * cifs_put_tcon() in the loop below won't release the server pointer. */ if (tcon_exist) server->srv_count++; spin_unlock(&cifs_tcp_ses_lock); list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) { rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon); if (!rc) cifs_reopen_persistent_handles(tcon); else resched = true; list_del_init(&tcon->rlist); cifs_put_tcon(tcon); } cifs_dbg(FYI, "Reconnecting tcons finished\n"); if (resched) queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ); mutex_unlock(&server->reconnect_mutex); /* now we can safely release srv struct */ if (tcon_exist) cifs_put_tcp_session(server, 1); } int SMB2_echo(struct TCP_Server_Info *server) { struct smb2_echo_req *req; int rc = 0; struct kvec iov[2]; struct smb_rqst rqst = { .rq_iov = iov, .rq_nvec = 2 }; unsigned int total_len; __be32 rfc1002_marker; cifs_dbg(FYI, "In echo request\n"); if (server->tcpStatus == CifsNeedNegotiate) { /* No need to send echo on newly established connections */ queue_delayed_work(cifsiod_wq, &server->reconnect, 0); return rc; } rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len); if (rc) return rc; req->sync_hdr.CreditRequest = cpu_to_le16(1); iov[0].iov_len = 4; rfc1002_marker = cpu_to_be32(total_len); iov[0].iov_base = &rfc1002_marker; iov[1].iov_len = total_len; iov[1].iov_base = (char *)req; rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL, server, CIFS_ECHO_OP); if (rc) cifs_dbg(FYI, "Echo request failed: %d\n", rc); cifs_small_buf_release(req); return rc; } int SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid) { struct smb2_flush_req *req; struct cifs_ses *ses = tcon->ses; struct kvec iov[1]; struct kvec rsp_iov; int resp_buftype; int rc = 0; int flags = 0; unsigned int total_len; cifs_dbg(FYI, "Flush\n"); if (!ses || !(ses->server)) return -EIO; rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len); if (rc) return rc; if (encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; req->PersistentFileId = persistent_fid; req->VolatileFileId = volatile_fid; iov[0].iov_base = (char *)req; iov[0].iov_len = total_len; rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov); cifs_small_buf_release(req); if (rc != 0) cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE); free_rsp_buf(resp_buftype, rsp_iov.iov_base); return rc; } /* * To form a chain of read requests, any read requests after the first should * have the end_of_chain boolean set to true. */ static int smb2_new_read_req(void **buf, unsigned int *total_len, struct cifs_io_parms *io_parms, struct cifs_readdata *rdata, unsigned int remaining_bytes, int request_type) { int rc = -EACCES; struct smb2_read_plain_req *req = NULL; struct smb2_sync_hdr *shdr; struct TCP_Server_Info *server; rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req, total_len); if (rc) return rc; server = io_parms->tcon->ses->server; if (server == NULL) return -ECONNABORTED; shdr = &req->sync_hdr; shdr->ProcessId = cpu_to_le32(io_parms->pid); req->PersistentFileId = io_parms->persistent_fid; req->VolatileFileId = io_parms->volatile_fid; req->ReadChannelInfoOffset = 0; /* reserved */ req->ReadChannelInfoLength = 0; /* reserved */ req->Channel = 0; /* reserved */ req->MinimumCount = 0; req->Length = cpu_to_le32(io_parms->length); req->Offset = cpu_to_le64(io_parms->offset); if (request_type & CHAINED_REQUEST) { if (!(request_type & END_OF_CHAIN)) { /* next 8-byte aligned request */ *total_len = DIV_ROUND_UP(*total_len, 8) * 8; shdr->NextCommand = cpu_to_le32(*total_len); } else /* END_OF_CHAIN */ shdr->NextCommand = 0; if (request_type & RELATED_REQUEST) { shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS; /* * Related requests use info from previous read request * in chain. */ shdr->SessionId = 0xFFFFFFFF; shdr->TreeId = 0xFFFFFFFF; req->PersistentFileId = 0xFFFFFFFF; req->VolatileFileId = 0xFFFFFFFF; } } if (remaining_bytes > io_parms->length) req->RemainingBytes = cpu_to_le32(remaining_bytes); else req->RemainingBytes = 0; *buf = req; return rc; } static void smb2_readv_callback(struct mid_q_entry *mid) { struct cifs_readdata *rdata = mid->callback_data; struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink); struct TCP_Server_Info *server = tcon->ses->server; struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)rdata->iov[1].iov_base; unsigned int credits_received = 1; struct smb_rqst rqst = { .rq_iov = rdata->iov, .rq_nvec = 2, .rq_pages = rdata->pages, .rq_npages = rdata->nr_pages, .rq_pagesz = rdata->pagesz, .rq_tailsz = rdata->tailsz }; cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n", __func__, mid->mid, mid->mid_state, rdata->result, rdata->bytes); switch (mid->mid_state) { case MID_RESPONSE_RECEIVED: credits_received = le16_to_cpu(shdr->CreditRequest); /* result already set, check signature */ if (server->sign && !mid->decrypted) { int rc; rc = smb2_verify_signature(&rqst, server); if (rc) cifs_dbg(VFS, "SMB signature verification returned error = %d\n", rc); } /* FIXME: should this be counted toward the initiating task? */ task_io_account_read(rdata->got_bytes); cifs_stats_bytes_read(tcon, rdata->got_bytes); break; case MID_REQUEST_SUBMITTED: case MID_RETRY_NEEDED: rdata->result = -EAGAIN; if (server->sign && rdata->got_bytes) /* reset bytes number since we can not check a sign */ rdata->got_bytes = 0; /* FIXME: should this be counted toward the initiating task? */ task_io_account_read(rdata->got_bytes); cifs_stats_bytes_read(tcon, rdata->got_bytes); break; default: if (rdata->result != -ENODATA) rdata->result = -EIO; } if (rdata->result) cifs_stats_fail_inc(tcon, SMB2_READ_HE); queue_work(cifsiod_wq, &rdata->work); DeleteMidQEntry(mid); add_credits(server, credits_received, 0); } /* smb2_async_readv - send an async read, and set up mid to handle result */ int smb2_async_readv(struct cifs_readdata *rdata) { int rc, flags = 0; char *buf; struct smb2_sync_hdr *shdr; struct cifs_io_parms io_parms; struct smb_rqst rqst = { .rq_iov = rdata->iov, .rq_nvec = 2 }; struct TCP_Server_Info *server; unsigned int total_len; __be32 req_len; cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n", __func__, rdata->offset, rdata->bytes); io_parms.tcon = tlink_tcon(rdata->cfile->tlink); io_parms.offset = rdata->offset; io_parms.length = rdata->bytes; io_parms.persistent_fid = rdata->cfile->fid.persistent_fid; io_parms.volatile_fid = rdata->cfile->fid.volatile_fid; io_parms.pid = rdata->pid; server = io_parms.tcon->ses->server; rc = smb2_new_read_req( (void **) &buf, &total_len, &io_parms, rdata, 0, 0); if (rc) { if (rc == -EAGAIN && rdata->credits) { /* credits was reset by reconnect */ rdata->credits = 0; /* reduce in_flight value since we won't send the req */ spin_lock(&server->req_lock); server->in_flight--; spin_unlock(&server->req_lock); } return rc; } if (encryption_required(io_parms.tcon)) flags |= CIFS_TRANSFORM_REQ; req_len = cpu_to_be32(total_len); rdata->iov[0].iov_base = &req_len; rdata->iov[0].iov_len = sizeof(__be32); rdata->iov[1].iov_base = buf; rdata->iov[1].iov_len = total_len; shdr = (struct smb2_sync_hdr *)buf; if (rdata->credits) { shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes, SMB2_MAX_BUFFER_SIZE)); shdr->CreditRequest = shdr->CreditCharge; spin_lock(&server->req_lock); server->credits += rdata->credits - le16_to_cpu(shdr->CreditCharge); spin_unlock(&server->req_lock); wake_up(&server->request_q); flags |= CIFS_HAS_CREDITS; } kref_get(&rdata->refcount); rc = cifs_call_async(io_parms.tcon->ses->server, &rqst, cifs_readv_receive, smb2_readv_callback, smb3_handle_read_data, rdata, flags); if (rc) { kref_put(&rdata->refcount, cifs_readdata_release); cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE); } cifs_small_buf_release(buf); return rc; } int SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms, unsigned int *nbytes, char **buf, int *buf_type) { int resp_buftype, rc = -EACCES; struct smb2_read_plain_req *req = NULL; struct smb2_read_rsp *rsp = NULL; struct smb2_sync_hdr *shdr; struct kvec iov[1]; struct kvec rsp_iov; unsigned int total_len; int flags = CIFS_LOG_ERROR; struct cifs_ses *ses = io_parms->tcon->ses; *nbytes = 0; rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0); if (rc) return rc; if (encryption_required(io_parms->tcon)) flags |= CIFS_TRANSFORM_REQ; iov[0].iov_base = (char *)req; iov[0].iov_len = total_len; rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov); cifs_small_buf_release(req); rsp = (struct smb2_read_rsp *)rsp_iov.iov_base; if (rc) { if (rc != -ENODATA) { cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE); cifs_dbg(VFS, "Send error in read = %d\n", rc); } free_rsp_buf(resp_buftype, rsp_iov.iov_base); return rc == -ENODATA ? 0 : rc; } *nbytes = le32_to_cpu(rsp->DataLength); if ((*nbytes > CIFS_MAX_MSGSIZE) || (*nbytes > io_parms->length)) { cifs_dbg(FYI, "bad length %d for count %d\n", *nbytes, io_parms->length); rc = -EIO; *nbytes = 0; } shdr = get_sync_hdr(rsp); if (*buf) { memcpy(*buf, (char *)shdr + rsp->DataOffset, *nbytes); free_rsp_buf(resp_buftype, rsp_iov.iov_base); } else if (resp_buftype != CIFS_NO_BUFFER) { *buf = rsp_iov.iov_base; if (resp_buftype == CIFS_SMALL_BUFFER) *buf_type = CIFS_SMALL_BUFFER; else if (resp_buftype == CIFS_LARGE_BUFFER) *buf_type = CIFS_LARGE_BUFFER; } return rc; } /* * Check the mid_state and signature on received buffer (if any), and queue the * workqueue completion task. */ static void smb2_writev_callback(struct mid_q_entry *mid) { struct cifs_writedata *wdata = mid->callback_data; struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink); unsigned int written; struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf; unsigned int credits_received = 1; switch (mid->mid_state) { case MID_RESPONSE_RECEIVED: credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest); wdata->result = smb2_check_receive(mid, tcon->ses->server, 0); if (wdata->result != 0) break; written = le32_to_cpu(rsp->DataLength); /* * Mask off high 16 bits when bytes written as returned * by the server is greater than bytes requested by the * client. OS/2 servers are known to set incorrect * CountHigh values. */ if (written > wdata->bytes) written &= 0xFFFF; if (written < wdata->bytes) wdata->result = -ENOSPC; else wdata->bytes = written; break; case MID_REQUEST_SUBMITTED: case MID_RETRY_NEEDED: wdata->result = -EAGAIN; break; default: wdata->result = -EIO; break; } if (wdata->result) cifs_stats_fail_inc(tcon, SMB2_WRITE_HE); queue_work(cifsiod_wq, &wdata->work); DeleteMidQEntry(mid); add_credits(tcon->ses->server, credits_received, 0); } /* smb2_async_writev - send an async write, and set up mid to handle result */ int smb2_async_writev(struct cifs_writedata *wdata, void (*release)(struct kref *kref)) { int rc = -EACCES, flags = 0; struct smb2_write_req *req = NULL; struct smb2_sync_hdr *shdr; struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink); struct TCP_Server_Info *server = tcon->ses->server; struct kvec iov[2]; struct smb_rqst rqst = { }; unsigned int total_len; __be32 rfc1002_marker; rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len); if (rc) { if (rc == -EAGAIN && wdata->credits) { /* credits was reset by reconnect */ wdata->credits = 0; /* reduce in_flight value since we won't send the req */ spin_lock(&server->req_lock); server->in_flight--; spin_unlock(&server->req_lock); } goto async_writev_out; } if (encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; shdr = (struct smb2_sync_hdr *)req; shdr->ProcessId = cpu_to_le32(wdata->cfile->pid); req->PersistentFileId = wdata->cfile->fid.persistent_fid; req->VolatileFileId = wdata->cfile->fid.volatile_fid; req->WriteChannelInfoOffset = 0; req->WriteChannelInfoLength = 0; req->Channel = 0; req->Offset = cpu_to_le64(wdata->offset); req->DataOffset = cpu_to_le16( offsetof(struct smb2_write_req, Buffer)); req->RemainingBytes = 0; /* 4 for rfc1002 length field and 1 for Buffer */ iov[0].iov_len = 4; rfc1002_marker = cpu_to_be32(total_len - 1 + wdata->bytes); iov[0].iov_base = &rfc1002_marker; iov[1].iov_len = total_len - 1; iov[1].iov_base = (char *)req; rqst.rq_iov = iov; rqst.rq_nvec = 2; rqst.rq_pages = wdata->pages; rqst.rq_npages = wdata->nr_pages; rqst.rq_pagesz = wdata->pagesz; rqst.rq_tailsz = wdata->tailsz; cifs_dbg(FYI, "async write at %llu %u bytes\n", wdata->offset, wdata->bytes); req->Length = cpu_to_le32(wdata->bytes); if (wdata->credits) { shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes, SMB2_MAX_BUFFER_SIZE)); shdr->CreditRequest = shdr->CreditCharge; spin_lock(&server->req_lock); server->credits += wdata->credits - le16_to_cpu(shdr->CreditCharge); spin_unlock(&server->req_lock); wake_up(&server->request_q); flags |= CIFS_HAS_CREDITS; } kref_get(&wdata->refcount); rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL, wdata, flags); if (rc) { kref_put(&wdata->refcount, release); cifs_stats_fail_inc(tcon, SMB2_WRITE_HE); } async_writev_out: cifs_small_buf_release(req); return rc; } /* * SMB2_write function gets iov pointer to kvec array with n_vec as a length. * The length field from io_parms must be at least 1 and indicates a number of * elements with data to write that begins with position 1 in iov array. All * data length is specified by count. */ int SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms, unsigned int *nbytes, struct kvec *iov, int n_vec) { int rc = 0; struct smb2_write_req *req = NULL; struct smb2_write_rsp *rsp = NULL; int resp_buftype; struct kvec rsp_iov; int flags = 0; unsigned int total_len; *nbytes = 0; if (n_vec < 1) return rc; rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req, &total_len); if (rc) return rc; if (io_parms->tcon->ses->server == NULL) return -ECONNABORTED; if (encryption_required(io_parms->tcon)) flags |= CIFS_TRANSFORM_REQ; req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid); req->PersistentFileId = io_parms->persistent_fid; req->VolatileFileId = io_parms->volatile_fid; req->WriteChannelInfoOffset = 0; req->WriteChannelInfoLength = 0; req->Channel = 0; req->Length = cpu_to_le32(io_parms->length); req->Offset = cpu_to_le64(io_parms->offset); req->DataOffset = cpu_to_le16( offsetof(struct smb2_write_req, Buffer)); req->RemainingBytes = 0; iov[0].iov_base = (char *)req; /* 1 for Buffer */ iov[0].iov_len = total_len - 1; rc = smb2_send_recv(xid, io_parms->tcon->ses, iov, n_vec + 1, &resp_buftype, flags, &rsp_iov); cifs_small_buf_release(req); rsp = (struct smb2_write_rsp *)rsp_iov.iov_base; if (rc) { cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE); cifs_dbg(VFS, "Send error in write = %d\n", rc); } else *nbytes = le32_to_cpu(rsp->DataLength); free_rsp_buf(resp_buftype, rsp); return rc; } static unsigned int num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size) { int len; unsigned int entrycount = 0; unsigned int next_offset = 0; FILE_DIRECTORY_INFO *entryptr; if (bufstart == NULL) return 0; entryptr = (FILE_DIRECTORY_INFO *)bufstart; while (1) { entryptr = (FILE_DIRECTORY_INFO *) ((char *)entryptr + next_offset); if ((char *)entryptr + size > end_of_buf) { cifs_dbg(VFS, "malformed search entry would overflow\n"); break; } len = le32_to_cpu(entryptr->FileNameLength); if ((char *)entryptr + len + size > end_of_buf) { cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n", end_of_buf); break; } *lastentry = (char *)entryptr; entrycount++; next_offset = le32_to_cpu(entryptr->NextEntryOffset); if (!next_offset) break; } return entrycount; } /* * Readdir/FindFirst */ int SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, int index, struct cifs_search_info *srch_inf) { struct smb2_query_directory_req *req; struct smb2_query_directory_rsp *rsp = NULL; struct kvec iov[2]; struct kvec rsp_iov; int rc = 0; int len; int resp_buftype = CIFS_NO_BUFFER; unsigned char *bufptr; struct TCP_Server_Info *server; struct cifs_ses *ses = tcon->ses; __le16 asteriks = cpu_to_le16('*'); char *end_of_smb; unsigned int output_size = CIFSMaxBufSize; size_t info_buf_size; int flags = 0; unsigned int total_len; if (ses && (ses->server)) server = ses->server; else return -EIO; rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req, &total_len); if (rc) return rc; if (encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; switch (srch_inf->info_level) { case SMB_FIND_FILE_DIRECTORY_INFO: req->FileInformationClass = FILE_DIRECTORY_INFORMATION; info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1; break; case SMB_FIND_FILE_ID_FULL_DIR_INFO: req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION; info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1; break; default: cifs_dbg(VFS, "info level %u isn't supported\n", srch_inf->info_level); rc = -EINVAL; goto qdir_exit; } req->FileIndex = cpu_to_le32(index); req->PersistentFileId = persistent_fid; req->VolatileFileId = volatile_fid; len = 0x2; bufptr = req->Buffer; memcpy(bufptr, &asteriks, len); req->FileNameOffset = cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1); req->FileNameLength = cpu_to_le16(len); /* * BB could be 30 bytes or so longer if we used SMB2 specific * buffer lengths, but this is safe and close enough. */ output_size = min_t(unsigned int, output_size, server->maxBuf); output_size = min_t(unsigned int, output_size, 2 << 15); req->OutputBufferLength = cpu_to_le32(output_size); iov[0].iov_base = (char *)req; /* 1 for Buffer */ iov[0].iov_len = total_len - 1; iov[1].iov_base = (char *)(req->Buffer); iov[1].iov_len = len; rc = smb2_send_recv(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov); cifs_small_buf_release(req); rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base; if (rc) { if (rc == -ENODATA && rsp->hdr.sync_hdr.Status == STATUS_NO_MORE_FILES) { srch_inf->endOfSearch = true; rc = 0; } cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE); goto qdir_exit; } rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset), le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr, info_buf_size); if (rc) goto qdir_exit; srch_inf->unicode = true; if (srch_inf->ntwrk_buf_start) { if (srch_inf->smallBuf) cifs_small_buf_release(srch_inf->ntwrk_buf_start); else cifs_buf_release(srch_inf->ntwrk_buf_start); } srch_inf->ntwrk_buf_start = (char *)rsp; srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ + (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset); /* 4 for rfc1002 length field */ end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr; srch_inf->entries_in_buffer = num_entries(srch_inf->srch_entries_start, end_of_smb, &srch_inf->last_entry, info_buf_size); srch_inf->index_of_last_entry += srch_inf->entries_in_buffer; cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n", srch_inf->entries_in_buffer, srch_inf->index_of_last_entry, srch_inf->srch_entries_start, srch_inf->last_entry); if (resp_buftype == CIFS_LARGE_BUFFER) srch_inf->smallBuf = false; else if (resp_buftype == CIFS_SMALL_BUFFER) srch_inf->smallBuf = true; else cifs_dbg(VFS, "illegal search buffer type\n"); return rc; qdir_exit: free_rsp_buf(resp_buftype, rsp); return rc; } static int send_set_info(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class, u8 info_type, u32 additional_info, unsigned int num, void **data, unsigned int *size) { struct smb2_set_info_req *req; struct smb2_set_info_rsp *rsp = NULL; struct kvec *iov; struct kvec rsp_iov; int rc = 0; int resp_buftype; unsigned int i; struct cifs_ses *ses = tcon->ses; int flags = 0; unsigned int total_len; if (!ses || !(ses->server)) return -EIO; if (!num) return -EINVAL; iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL); if (!iov) return -ENOMEM; rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len); if (rc) { kfree(iov); return rc; } if (encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; req->sync_hdr.ProcessId = cpu_to_le32(pid); req->InfoType = info_type; req->FileInfoClass = info_class; req->PersistentFileId = persistent_fid; req->VolatileFileId = volatile_fid; req->AdditionalInformation = cpu_to_le32(additional_info); req->BufferOffset = cpu_to_le16(sizeof(struct smb2_set_info_req) - 1); req->BufferLength = cpu_to_le32(*size); memcpy(req->Buffer, *data, *size); total_len += *size; iov[0].iov_base = (char *)req; /* 1 for Buffer */ iov[0].iov_len = total_len - 1; for (i = 1; i < num; i++) { le32_add_cpu(&req->BufferLength, size[i]); iov[i].iov_base = (char *)data[i]; iov[i].iov_len = size[i]; } rc = smb2_send_recv(xid, ses, iov, num, &resp_buftype, flags, &rsp_iov); cifs_small_buf_release(req); rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base; if (rc != 0) cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE); free_rsp_buf(resp_buftype, rsp); kfree(iov); return rc; } int SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, __le16 *target_file) { struct smb2_file_rename_info info; void **data; unsigned int size[2]; int rc; int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX)); data = kmalloc(sizeof(void *) * 2, GFP_KERNEL); if (!data) return -ENOMEM; info.ReplaceIfExists = 1; /* 1 = replace existing target with new */ /* 0 = fail if target already exists */ info.RootDirectory = 0; /* MBZ for network ops (why does spec say?) */ info.FileNameLength = cpu_to_le32(len); data[0] = &info; size[0] = sizeof(struct smb2_file_rename_info); data[1] = target_file; size[1] = len + 2 /* null */; rc = send_set_info(xid, tcon, persistent_fid, volatile_fid, current->tgid, FILE_RENAME_INFORMATION, SMB2_O_INFO_FILE, 0, 2, data, size); kfree(data); return rc; } int SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid) { __u8 delete_pending = 1; void *data; unsigned int size; data = &delete_pending; size = 1; /* sizeof __u8 */ return send_set_info(xid, tcon, persistent_fid, volatile_fid, current->tgid, FILE_DISPOSITION_INFORMATION, SMB2_O_INFO_FILE, 0, 1, &data, &size); } int SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, __le16 *target_file) { struct smb2_file_link_info info; void **data; unsigned int size[2]; int rc; int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX)); data = kmalloc(sizeof(void *) * 2, GFP_KERNEL); if (!data) return -ENOMEM; info.ReplaceIfExists = 0; /* 1 = replace existing link with new */ /* 0 = fail if link already exists */ info.RootDirectory = 0; /* MBZ for network ops (why does spec say?) */ info.FileNameLength = cpu_to_le32(len); data[0] = &info; size[0] = sizeof(struct smb2_file_link_info); data[1] = target_file; size[1] = len + 2 /* null */; rc = send_set_info(xid, tcon, persistent_fid, volatile_fid, current->tgid, FILE_LINK_INFORMATION, SMB2_O_INFO_FILE, 0, 2, data, size); kfree(data); return rc; } int SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc) { struct smb2_file_eof_info info; void *data; unsigned int size; info.EndOfFile = *eof; data = &info; size = sizeof(struct smb2_file_eof_info); if (is_falloc) return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid, FILE_ALLOCATION_INFORMATION, SMB2_O_INFO_FILE, 0, 1, &data, &size); else return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE, 0, 1, &data, &size); } int SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf) { unsigned int size; size = sizeof(FILE_BASIC_INFO); return send_set_info(xid, tcon, persistent_fid, volatile_fid, current->tgid, FILE_BASIC_INFORMATION, SMB2_O_INFO_FILE, 0, 1, (void **)&buf, &size); } int SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, struct cifs_ntsd *pnntsd, int pacllen, int aclflag) { return send_set_info(xid, tcon, persistent_fid, volatile_fid, current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag, 1, (void **)&pnntsd, &pacllen); } int SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, struct smb2_file_full_ea_info *buf, int len) { return send_set_info(xid, tcon, persistent_fid, volatile_fid, current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 0, 1, (void **)&buf, &len); } int SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon, const u64 persistent_fid, const u64 volatile_fid, __u8 oplock_level) { int rc; struct smb2_oplock_break_req *req = NULL; struct cifs_ses *ses = tcon->ses; int flags = CIFS_OBREAK_OP; unsigned int total_len; struct kvec iov[1]; struct kvec rsp_iov; int resp_buf_type; cifs_dbg(FYI, "SMB2_oplock_break\n"); rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req, &total_len); if (rc) return rc; if (encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; req->VolatileFid = volatile_fid; req->PersistentFid = persistent_fid; req->OplockLevel = oplock_level; req->sync_hdr.CreditRequest = cpu_to_le16(1); flags |= CIFS_NO_RESP; iov[0].iov_base = (char *)req; iov[0].iov_len = total_len; rc = smb2_send_recv(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov); cifs_small_buf_release(req); if (rc) { cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE); cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc); } return rc; } static void copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf, struct kstatfs *kst) { kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) * le32_to_cpu(pfs_inf->SectorsPerAllocationUnit); kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits); kst->f_bfree = kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits); return; } static int build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level, int outbuf_len, u64 persistent_fid, u64 volatile_fid) { int rc; struct smb2_query_info_req *req; unsigned int total_len; cifs_dbg(FYI, "Query FSInfo level %d\n", level); if ((tcon->ses == NULL) || (tcon->ses->server == NULL)) return -EIO; rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req, &total_len); if (rc) return rc; req->InfoType = SMB2_O_INFO_FILESYSTEM; req->FileInfoClass = level; req->PersistentFileId = persistent_fid; req->VolatileFileId = volatile_fid; /* 1 for pad */ req->InputBufferOffset = cpu_to_le16(sizeof(struct smb2_query_info_req) - 1); req->OutputBufferLength = cpu_to_le32( outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4); iov->iov_base = (char *)req; iov->iov_len = total_len; return 0; } int SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata) { struct smb2_query_info_rsp *rsp = NULL; struct kvec iov; struct kvec rsp_iov; int rc = 0; int resp_buftype; struct cifs_ses *ses = tcon->ses; struct smb2_fs_full_size_info *info = NULL; int flags = 0; rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION, sizeof(struct smb2_fs_full_size_info), persistent_fid, volatile_fid); if (rc) return rc; if (encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; rc = smb2_send_recv(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov); cifs_small_buf_release(iov.iov_base); if (rc) { cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE); goto qfsinf_exit; } rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base; info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ + le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr); rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset), le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr, sizeof(struct smb2_fs_full_size_info)); if (!rc) copy_fs_info_to_kstatfs(info, fsdata); qfsinf_exit: free_rsp_buf(resp_buftype, rsp_iov.iov_base); return rc; } int SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, int level) { struct smb2_query_info_rsp *rsp = NULL; struct kvec iov; struct kvec rsp_iov; int rc = 0; int resp_buftype, max_len, min_len; struct cifs_ses *ses = tcon->ses; unsigned int rsp_len, offset; int flags = 0; if (level == FS_DEVICE_INFORMATION) { max_len = sizeof(FILE_SYSTEM_DEVICE_INFO); min_len = sizeof(FILE_SYSTEM_DEVICE_INFO); } else if (level == FS_ATTRIBUTE_INFORMATION) { max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO); min_len = MIN_FS_ATTR_INFO_SIZE; } else if (level == FS_SECTOR_SIZE_INFORMATION) { max_len = sizeof(struct smb3_fs_ss_info); min_len = sizeof(struct smb3_fs_ss_info); } else { cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level); return -EINVAL; } rc = build_qfs_info_req(&iov, tcon, level, max_len, persistent_fid, volatile_fid); if (rc) return rc; if (encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; rc = smb2_send_recv(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov); cifs_small_buf_release(iov.iov_base); if (rc) { cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE); goto qfsattr_exit; } rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base; rsp_len = le32_to_cpu(rsp->OutputBufferLength); offset = le16_to_cpu(rsp->OutputBufferOffset); rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len); if (rc) goto qfsattr_exit; if (level == FS_ATTRIBUTE_INFORMATION) memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset + (char *)&rsp->hdr, min_t(unsigned int, rsp_len, max_len)); else if (level == FS_DEVICE_INFORMATION) memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO)); else if (level == FS_SECTOR_SIZE_INFORMATION) { struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *) (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr); tcon->ss_flags = le32_to_cpu(ss_info->Flags); tcon->perf_sector_size = le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf); } qfsattr_exit: free_rsp_buf(resp_buftype, rsp_iov.iov_base); return rc; } int smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon, const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid, const __u32 num_lock, struct smb2_lock_element *buf) { int rc = 0; struct smb2_lock_req *req = NULL; struct kvec iov[2]; struct kvec rsp_iov; int resp_buf_type; unsigned int count; int flags = CIFS_NO_RESP; unsigned int total_len; cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock); rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len); if (rc) return rc; if (encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; req->sync_hdr.ProcessId = cpu_to_le32(pid); req->LockCount = cpu_to_le16(num_lock); req->PersistentFileId = persist_fid; req->VolatileFileId = volatile_fid; count = num_lock * sizeof(struct smb2_lock_element); iov[0].iov_base = (char *)req; iov[0].iov_len = total_len - sizeof(struct smb2_lock_element); iov[1].iov_base = (char *)buf; iov[1].iov_len = count; cifs_stats_inc(&tcon->stats.cifs_stats.num_locks); rc = smb2_send_recv(xid, tcon->ses, iov, 2, &resp_buf_type, flags, &rsp_iov); cifs_small_buf_release(req); if (rc) { cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc); cifs_stats_fail_inc(tcon, SMB2_LOCK_HE); } return rc; } int SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon, const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid, const __u64 length, const __u64 offset, const __u32 lock_flags, const bool wait) { struct smb2_lock_element lock; lock.Offset = cpu_to_le64(offset); lock.Length = cpu_to_le64(length); lock.Flags = cpu_to_le32(lock_flags); if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK) lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY); return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock); } int SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon, __u8 *lease_key, const __le32 lease_state) { int rc; struct smb2_lease_ack *req = NULL; struct cifs_ses *ses = tcon->ses; int flags = CIFS_OBREAK_OP; unsigned int total_len; struct kvec iov[1]; struct kvec rsp_iov; int resp_buf_type; cifs_dbg(FYI, "SMB2_lease_break\n"); rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req, &total_len); if (rc) return rc; if (encryption_required(tcon)) flags |= CIFS_TRANSFORM_REQ; req->sync_hdr.CreditRequest = cpu_to_le16(1); req->StructureSize = cpu_to_le16(36); total_len += 12; memcpy(req->LeaseKey, lease_key, 16); req->LeaseState = lease_state; flags |= CIFS_NO_RESP; iov[0].iov_base = (char *)req; iov[0].iov_len = total_len; rc = smb2_send_recv(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov); cifs_small_buf_release(req); if (rc) { cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE); cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc); } return rc; }